medulloblastoma/nicotine

The tissue distribution of the tobacco-specific N-nitrosamine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), in the F344 rat was studied by whole-body autoradiography and high-performance liquid chromatography. The results of the wholebody autoradiography experiments indicate that the

The TE671 human medulloblastoma cell line expresses a variety of characteristics of human neurons. Among these characteristics is the expression of membrane-bound high-affinity binding sites for alpha-bungarotoxin, which is a potent antagonist of functional nicotinic acetylcholine receptors on these

Some properties of functional nicotinic acetylcholine receptors (nAcChoR) expressed by the PC12 rat pheochromocytoma or the TE671 human medulloblastoma were studied by the use of an isotopic rubidium ion efflux assay. The assay involves active uptake of 86Rb+ via a ouabain-sensitive mechanism to

Studies were conducted on curaremimetic neurotoxin binding to the nicotinic acetylcholine receptor present on membrane fractions derived from the human medulloblastoma clonal line, TE671. High-affinity binding sites (KD = 2 nM for 1-h incubation at 20 degrees C) and low-affinity binding sites (KD =

The human medulloblastoma TE 671 cell line has been evaluated as a model for studying expression of transiently transfected phenylethanolamine N-methyltransferase (PNMT) promoter-fusion gene constructs. Because TE 671 cells are one of few continuous lines exhibiting a neuronal phenotype, possess

The human neuromedulloblastoma cell line TE671 is shown by single-channel recordings to express nicotinic acetylcholine receptors (AChRs) that are blocked by alpha-bungarotoxin (alpha Bgt). These AChRs do not react with antisera to the alpha Bgt-binding protein of brain or with monoclonal antibodies

The spiropyrrolizidine oximes 236 and 222 and a related spiropyrrolizidine alkaloid, nitropolyzonamine, block nicotinic receptor channels in rat pheochromocytoma PC12 cells and in human medulloblastoma TE671 cells. In PC12 cells with an alpha 3 beta 4(5)-nicotinic receptor, both the

Synthetic (+)- and (-)-epibatidine (an alkaloid originally characterized from frog skin) have potent analgetic activity in mice, using the hot-plate assay. The natural (+)-enantiomer, with an ED50 of about 1.5 micrograms/kg upon intraperitoneal injection, is about 2-fold more potent than the

(+/-)-Pseudophrynaminol inhibited carbamylcholine-elicited sodium-22 influx with an IC50 value of about 0.3 microM in both rat pheochromocytoma PC12 cells (ganglionic-type nicotinic receptor) and human medulloblastoma TE671 cells (neuromuscular-type nicotinic receptor). The inhibition in both cell

The human medulloblastoma cell line TE671 has been investigated and found to have several 'neuron-like' properties, including the presence of a functional nicotinic receptor. The cell line TE671 is composed of at least 5 stable morphologic cell types. Resting potentials recorded with intracellular

Isoprene, the monomeric unit of natural rubber and naturally occurring terpenes and steroids, is primarily obtained as a by-product of naphtha cracking for ethylene production. It is emitted from plants and trees, has been detected in tobacco smoke and automobile exhaust, and was identified as a

The role of parental occupational exposure in childhood brain tumors was investigated in a population-based case-control study grouping 251 cases and 601 controls from three European centers: Milan (Italy), Paris (France), and Valencia (Spain). Parental occupational exposure to solvents and